Nut-lock.



- No. 766,782. PATENTED AUG. 2, 1904.

. AOKER.

APPLICATION FILED OOT 2 1 l 9 0 3 N 0 M 0 D E L.

.. UNITED STATES Patented August 2, 1904.

PATENT OFFICE.

EUGEN WACKER, OF STOCKTON, CALIFORNIA, ASSIGNOR TO PHIL LAND- MANN, OF STOCKTON, CALIFORNIA, ALBERT ANCKER, OF TEl-IACHAII,

CALIFORNIA, AND M. DAVIDSON,

OF STOCKTON, CALIFORNIA.

NUT-LOCK.

SPECIFICATION forming part of Letters Patent No. 766,782, dated August 2, 1904.

Application filed October 2, 1903.

To all whom it may concern.-

Be it known that I, EUG'EN WACKER, a citizen of the United States, residing at Stockton, in the county of San Joaquin and State of California, have invented certain new and useful Improvements in N ut-Locks, of which the following is a specification.

My invention relates to improvements in nut-locks, the object of my invention being to provide a device of this character which shall be cheap and simple in construction, convenient in operation, and eifective in its result.

My invention therefore resides in the novel construction, combination, and arrangement 1 5 of parts for the above ends hereinafter fully specified, and particularly pointed out in the claim.

In the accompanying drawings, Figure 1 is a longitudinal section of a bolt having thereon a nut constructed in accordance with my invention, said section being taken to one side of the axis of said bolt. Fig. 2 is a cross-section of the bolt close to the inner face of the nut. Fig. 3 is a view similar to Fig. 2, show- 2 5 ing the manner of releasing the lock to allow the nut to be unscrewed.

Referring to the drawings, 1 represents a bolt which difi'ers in its construction in no respect from ordinary bolts. 2 represents the 0 nut, in the inner face 3 of which is formed a locking-cavity 4:, having a rounded end 5 for the reception of a key 6, which has a rounded end to rest in the rounded end of the cavity. The cavity flares slightly toward the center of 3 5 the nut to permit a slight swing of said key therewithin. Said cavity does not, however, extend directly toward the center of the nut, but to one side thereof-namely, to the rear side-having regard to the movement of the 4 nut when screwing up. The consequence is that when so screwing up the inner end of the key swings to the rear side of the cavity and rides upon the thread of the nut, offering no resistance to the forward or screwing-up mo vement of the nut; but it prevents any unscrewing due to vibration or other accidental cause, owing to the fact that upon a rearward movement of the nut upon the bolt the inner end of Serial No. 175,531. (No model.)

the key catches or bites the thread of the bolt, and the deviation of the key from a direction 5 normal to the thread being slight the pressure caused by the engagement of the inner end of the key with the thread increases the biting action and efl'ectually prevents the unscrewing of the nut.

In order to insure the engagement of the inner end of the key with the thread, the rear side of the cavity is formed with a transverse recess 7, in which is fitted a spring 8, which I have here shown of rubber, although it need not necessarily be so; but a small coiled spring may be used. This insures the initial bite of the key on the thread necessary to positively prevent the accidental unscrewing of the nut.

To unscrew the nut when desired, there is 5 provided an unlocking-pin 9, which is passed into a groove or cavity 10, formed in the inner face of the nut, the groove at its inner end running into the locking-cavity i. The inner end of the pin can thus be pressed against 7 said key, and by pressure applied to said pin the inner end of the key may be forced away from the thread, permitting the nut to be unscrewed. Said pin is provided with a notch 11, which when the pin is pressed fully in ward is engaged by a tooth 12, extending inward at the side of the entrance of the unlock ing-groove. The engagement of said tooth with said notch holds the pin in its place, press ing the locking-key away from the bolt, and thus allows the nut to be more readily unscrewed.

Since the bolt is not changed in construction and the groove and cavity in the face of the nut can readily be stamped out when making 8 5 the nut and the locking and unlocking pin are small parts very easily made, the increased cost of construction is trifling, while at the same time there is provided an efiective and convenient nut-lock.

I claim In a nut-lock, a nut having movably mounted therein a locking-key engaging the thread. of the bolt slightly to the rear of the normal direction thereto, to bite said thread when unscrewing the nut, said nut having a transverse cavity to receive a pin to engage a key to hold handin the presence of two subscribing Wit it in its unlocking position and having a tooth nesses.

l 12 extending inward at the side of the entrance of the unlocking groove or cavity, said EUGEN WACKER' I 5 tooth being adapted to engage a notch in said W'itnesses:

pin, substantially as described. LEE W'ILLIAMs, I

In Witness whereof I have hereunto set my E. P. FOLTZ. 

